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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System - Diagnostic Codes & Symptom Tests >> Vehicle Stability Control System >> DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [09/2015 - 08/2019] >> Description
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DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [09/2015 - 08/2019]: Description

for Optitron Meter Type 

  1. The skid control ECU (brake actuator assembly) receives the signals from the ECM, steering angle sensor and yate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

for TFT Meter Type 

  1. The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor via the CAN communication system.
DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0073 Control Module Communication Bus OFF Any of the following is detected:
  1. A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.)
  2. When the +BS terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate sensor and steering angle sensor continues for 1 second or more.
  3. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that a delay in receiving data from the yaw rate sensor and steering angle sensor occurs more than once within 5 seconds.
 CAN communication system -
U0100 Lost Communication with ECM When the +BS terminal voltage is between 10 and 17.4 V, and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM
 -
U0124 Lost Communication with Lateral Acceleration Sensor Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, and the vehicle speed is 7 km/h or more, data from the acceleration sensor cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds.
    • The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Acceleration sensor (airbag sensor assembly) (for optitron meter type)
  • Acceleration sensor (yaw rate and acceleration sensor) (for TFT meter type)
 -
U0126 Lost Communication with Steering Angle Sensor Module Either of the following is detected:
  1. When the +BS terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.
  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.
    • The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Steering angle sensor
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